Moon Monkey
Smash Hero
I'm not all too concerned with "reps". If ZSS's move-set is distinguishable enough from Samus' than she can simply represent herself (which is kind of odd saying since they are the same person )@moon
That way would be equally effective but people would still try to argue it counts as one rep.
Besides, as long as the Final Smash connects these 2 entities of Samus, I see no reason why they should split.
The 2 are one and link into each other, the same way how Zelda and Shiek are linked; the only difference is that Samus has a Final Smash while Zelda has her down special to transform.